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An entrepreneur is planning a campsite-hotel in Romania, with a full outdoor gourmet restaurant attached, with an outdoor kitchen. There will be no cabins or other living structures, only tents and tepees. This campsite-hotel//restaurant should be attractive to people without much, if any, outdoor experience and allow them to live and eat outdoors without worrying about their safety from European brown bears. Living outdoors will be beyond the comfort level of many of the customers.

European brown bears are a danger in Romania, however docile they may be in other parts of Europe. See this article from Reuters and this article from Romanian Insider.com

I need to enclose an area at least 50 meters by 50 meters (164 feet by 164 feet) or 0.6 acre. For many reasons, I do not consider electric fencing as an option. It needs to be a physical concrete-pole fence. Metal will rust and/or will need to be painted regularly, and wood will be too weak probably. The area contains apple trees, and vegetables will be planted inside the area. There will be at least two enclosed areas, one for sleeping and one for eating. Parts of the fence will be behind bushes, so people will not feel confined, but they will know it is there for their protection.

What height does the fence need to be, and possibly any other parameters? Not sure if spikes at the top would be of any use? Likely the fence will need to be quite strong, with concrete poles smaller distance apart then the size of a bear, so he can't pass between by breaking the weaker material between the poles.

Is this feasible at all, or will bears break through anything, and climb over any fence?

Answers started going in the wrong direction, talking about locking away smelly food. Please focus on answering the question about parameters of the fence, not suggesting other solutions.

This will actually be several separate fenced areas: one for outdoor sleeping and one for the outdoor restaurant and outdoor kitchen. The restaurant will have rare steaks from wild venison, Vitamix blenders, gourmet coffee, freezers, ice-cream machine -- and that is just the beginning.

I'm not nearly enough of a bear expert to say anything for sure, but could it be an idea to only lock in the something smelly? In bear areas in the US campsites have steel bear boxes. The bear can't get to the food, and if it gets angry it gets angry at a metal box. Is there anything in the behavior of American and European bears that makes this sollution infeasible here?
– MonsterAug 12 '18 at 21:21

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Can you please specify which area you are talking about? I have yet to hear about any area in Europe where campers actually need to be worried about brown bears - they are much rarer and a lot shier than their brethren in US/CAN. E.g. I have been trekking in Scandinavia dozens of times for weeks and weeks over the last 10 years, and never once heard anyone mention bear safety.
– fgysinAug 13 '18 at 6:56

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@ChrisH I think its about an area where several tents, tipi, or even people sleeping under the stars will stay. Preferably to fence a large area, at least 50 meters as not to feel you are behind the fence, even parts of the fence being behind bushes, but still know its there somewhere.
– yannnAug 13 '18 at 8:28

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Like @fgysin , I am really curious as to why you consider Eurasian bears to be a danger warranting these kinds of measures. For instance, in Sweden, bears have killed two people in the last century -- and one of those victims was a hunter who had shot and wounded the bear. To put that in perspective: you're about 100 times more likely to die of lightning strike.
– PontAug 13 '18 at 9:54

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@yannn You don't need 50x50 meters for food and supplies. I give up. This question has moved so much it seems made up.
– paparazzoAug 13 '18 at 17:00

6 Answers
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While caging animals is slightly different than keeping animals out, it probably provides the best evidence for specifications. Animal enclosures need to be secure, because animals frequently attempt to escape enclosed spaces. I have never heard of a large animal attempting to break into an enclosed space. Sure, bears try and steal food from cars and sheds etc, but jumping a fence to get to food that is 25 m away seems different.

So just simple chain link fence? Brown bears are exceptional climbers. What's stopping them from climbing over it? Or are you actually suggesting building a chain link roof as well? That doesn't seem like it would make for a very comfy camping atmosphere...
– fgysinAug 14 '18 at 6:10

@fgysin appendix B talks about non-climbable barriers, but a simple chain link fence of the appropriate size (16' or 5m) is sufficient for keeping animals in without a roof. I am not aware of any evidence that keeping animals out is harder than keeping them in.
– StrongBadAug 14 '18 at 15:37

When you look at zoos they have like 12-15 feet (4–5 metre) of cement. If you are going to lay that many poles might as well pour a fence but it will not be cheap. You could probably build a small log cabin for less money.

The point is not to have a log cabin, the point is to camp safely outdoors.
– yannnAug 13 '18 at 5:53

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@yannn Then don't have a log cabin. I just stated it would probably be cheaper.
– paparazzoAug 13 '18 at 13:58

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@yannn What if you combine paparazzo's idea into what you want. At least for sleeping areas, do you think people would like a structure that is sort of like a log cabin but which has no roof, and maybe no floor? Even if it is not built to the standards StrongBad's answer, it would still be a heavy deterrent. Also, you could do this even if you do build a fenced in area... these partial-cabins could be another option in another spot. Or maybe a cabin with skylights. I know you think cabins aren't "outdoorsy" but some upscale folks think they are camping when they rent even a normal cabin.
– AaronAug 16 '18 at 14:56

@Aaron yes, that's what I am thinking about. Building a "tent" but with "poles" of the tent strong enough that the bear can not pass though it. The ground would be cotton, and over the structure of the tent, also cotton fabric would be pulled over when there is a chance of rain, still it would be permeable to fresh forest air, so you'd feel actually like in a tent, actually you will be in a kind-of-tent, just the tent will be not permeable to bears. Cotton fabric will cover the structure, so you won't feel like in a cage, actually it won't look much different then a normal tent, besides size.
– yannnSep 1 '18 at 18:58

Lacking clear evidence/reports that the Eurasian Brown Bear is actually a problem anywhere I am issuing a frame challenge in suggesting just stop worrying about bears.

If you want a passive bear-defence mechanism such as a non-electric fence it would need to be built exceptionally sturdy and rather high. This means a high initial investment and probably considerable maintenance costs.

From my current experience in hiking/trekking/camping in Europe bear safety is not a topic that is often talked about. Even in some areas where the map you linked shows permanent bear populations (e.g. northern Sweden) bear safety is not an issue.

Last but not least, your outdoor-seeking campers might well not like it very much to spend their tranquil camping days behind a massive fence. So unless the area to be fenced off is very large - large enough for the fence to be somewhere out of site (meaning much higher costs!) - the presence of the fence could likely decrease the appeal of your camp ground instead of increasing it. This is especially true if the bear-safety aspect is not something that potential campers are worrying about (which in my experience is not the case in Europe).

If you are absolutely set on a fence, then I think the only viable option is an electric fence, similar to what is used for cattle/horse pastures. These come in different strengths/voltages and I can't tell you which you would need. But I know that electric fences are used regularly and successfully to protect camps in heavy bear areas.1 Note that an electric fence is a deterrent rather than an impregnable barrier - but they are affordable, can be built (comparatively) low to the ground and the batteries last for months.

1: For example this guy spent months and months photographing the biggest species of brown bears on Kodiak island. He used electric fences to protect his camp sites.

People have different comfort levels. Not everyone will need to put their tent inside the fence, some may put it on another place if they feel comfortable with it, but those who otherwise fear bears would be able to choose to put inside the fence. Brown bear attacks are real in Romania, and in most of US there is only less deadly, smaller black bear, so the situation in Romania is much worse then the US, as they are as many bears per area as in US, but they are all the huge brown ones! I wouldn't worry so much if these where mostly black bears, which are more a nuisance.
– yannnAug 13 '18 at 12:21

Yes, I want to fence around an area large enough so that fence is not so visible, at least 50 x 50 meters, better 100 x 100 meters, behind some bushes to disguise the fence.
– yannnAug 13 '18 at 12:23

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@yann the fence will be necessarily much higher than bushes and comparable to trees; furthermore, you'll need to cut down trees behind it so that they're not climbable. The visual impression will necessarily be comparable to a prison compound, because that's what you'll have to build.
– PeterisAug 13 '18 at 13:20

@Peteris: why "a prison compound"? when you sleep in a house in the forest, you have a nice house and the bears won't come in (well, unless they do, but a solid house should stop bears). So now this would be like a house, but without the roof, and with grass and trees inside, with earth on the floor, and with air permeable walls (but not bear-permeable)? So the question is how to make walls which are not bear-permeable, but air-permeable, and blend in with the forest to make it appear as you sleep in the open forest? For example if the campground is on the top of a hill, but the fence below.
– yannnAug 13 '18 at 15:01

On BC's sunshine coast brown bears invade the suburbs for fallen fruit. 6 foot fences are insufficient, they scramble up and over, or break them. My stepson came out to find a bear in his front yard. Except for the caveat of mama and cub they are pretty quick to run off. No one is concerned. The bulk of reported wildlife injuries are from racoons.
– Sherwood BotsfordAug 16 '18 at 14:16

Turn your fence into a cage. If you have a 50×50 m² area, surround it by a 4 metre high fence, and fence the roof as well. That's 4×50×4 m² = 800 m² of fencing for the walls and 50×50 m² = 2500 m² for the roof, 3300 m² of bear-proof fence in total.

@CharlieBrumbaugh That fence is not going to keep a bear out. It has been 100% effective at stopping kids from getting eaten by bears, but it was also 100% effective before the fence was there.
– James JenkinsAug 13 '18 at 18:14

Bee keepers in central B.C. will use old school busses as portable bee yards. Each hive base is bolted to the floor, and a tunnel leads outside. They use a solar electric fence charger to charge the skin of the bus. This allows them to either move them from crop to crop in the fruit areas, or follow the fireweed bloom up the mountain in burned areas.

I think your best bet would be two fold: Put up an 8 foot wooden fence, using surplus telephone poles as the posts (here available for 80 cents canadian per foot in 35 foot lengths) and conventionals rails and battens (vertical planks). This is to reassure the campers. Outside the wooden fence run wires at roughly 2 foot intervals, supported on insulators. Make the poles about 2 feet taller than the boards, and run a wire along the top of the posts.

Electric fences are easily shorted to ground. Even a grass stem is sufficient. A string trimmer is a quick way to trim the vegetation back away from the bottom wire.

Before committing to a full version of this, make a smaller one, and test it by putting something that that bears love. (Rotting fish, carrion, honey, shampoo, bacon...) and seeing if the bear is successful at getting inside. There is a risk that the bear associates your site with food and visits frequently, but if you are creating a 'safe haven' spot for campers, you create a spot that is attractive to bears anyway. Bears have large territories. You would need to run this test for months.

Bear response depends on local activity. In parks like Yellowstone, there are no bad consequences for bears that approach humans and their food. They become a nuisance. In regions that are hunted, they are very wary. In true wilderness situations (Canada's north) they are unfamiliar with people, and will challenge you. There you need to convince them that you are a threat. I recently took a trip in Willmore Wilderness. We saw bear tracks daily, but no scat. My dog however reacted to something, and was spooked. We were all eyes for that kilometer. Bears reek. I suspect he caught a whiff of one a km upwind or so.

In passing: the standard bear attack prevention/response was to wear bells and carry red pepper spray. The joke making the rounds was that you could tell grizzly bear scat from brown bear scat by the presence of undigested bells, and a whiff of cayenne...

Its quite unlikely (however possible) that a bear will wander in the area, so testing with rotting fish won't prove anything. The closest bear may be many kilometers away for a long time and not smell the fish. However if the bear would be close enough to smell it, this would be an extremely bad idea to attract the bear to the camp, and associate the camp with food, so he comes again looking for more. I've seen a bear footprint within 1 km of the camp in November last year, so at least on one occasion a bear has been there, although no one seen one.
– yannnAug 19 '18 at 5:44

The existing answers, should be considered. But given that the OP wants to know how high to build a fence.

I know from experience that bears can climb 20 feet (6 meters) without diffuclty in seconds.

I would say the lowest height to be safe is probably around 100 feet (30 meters) but that is just to get the bear bored from climbing. In which case they would probably just dig under it, if they really wanted in.

Said another way: There is NO max height that will keep a bear from climbing over.

Climb a tree and climb a cement wall are not the same. Zoos do not have 100 feet enclosures.
– paparazzoAug 13 '18 at 17:19

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@paparazzo The questioner explicitly and exclusively specifies a concrete-pole fence; that much is indisputable. I added my own speculation as to why they require this, which may be entirely incorrect. But whatever the reason may be, solid walls are evidently not a permissible option for the question as stated.
– PontAug 13 '18 at 20:49